How to revert from 10.5 (Leopard) to 10.4 (Tiger).

I recently upgraded from OS X 10.4 to 10.5.
I don't like 10.5 at all and want to go back to 10.4.
My setup: Dual G5, two internal disks, one external, recently installed (to take advantage of Time Machine!!!) One of the internal disks holds the OS files (now 10.5, used to be 10.4). It also holds all the users (3), the Applications folder, etc.
In a nutshell, what I think I could do is this:
• do a clean install of 10.4 on the external disk.
• Use Migration Assistant to move users from the internal disk to the new (external) installation.
• Copy the Applications folder from the internal to the new installation (I'm not sure if Migration Assistant does that).
• Copy the System 9 System Folder from the internal to the external disk.
• Re-boot from the external disk and run from it to make sure that all needed applications are running fine.
Now to get rid of 10.5 and re-install OS 10.4 on the internal disk, which is where I want it:
• Do an EraseandInstall of 10.4 on the internal disk.
• Use Migration Assistant to move all possible things (Users, maybe Applications) from the external to the new installation (on internal disk).
• Re-copy System 9's System Folder to the internal disk.
• Re=boot from the internal disk and eventually remove the (temporary) installation on the external disk, after I'm satisfied everything is running OK from the internal disk OS installation.
Does this procedure make sense?
Additional questions:
• How can I tell if I will be able to boot from an external drive? The one I have is a LaCie FireWire drive.
• Does Migration Assistant preserve all the current authorities, etc. for the various users?
• Does Migration Assistant move the Applications folder? If not, is there, generally speaking, a problem with just copying this folder (as opposed to installing the individual applications)?
Thanks! All suggestions are welcome!

I'd consider installing 10.4 and OS 9 on the external disk on one partition. Clone your current setup to another partition using DiskUtility. Backup your important files to DVD's, another HD, or wherever in case the external HD becomes unreliable.
Use DiskUtility to erase the internal HD and clone the 10.4 install to the internal HD.
I'm not sure I would rely on migration assistant to move stuff from a 10.5 install to a 10.4 install. Could be asking fro troble. I'd manually move stuff (pics, music, email, etc...) from one place to the other.

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